The fund seeks to achieve its investment objective by investing at least 80% of its total assets (exclusive of collateral held from securities lending) in the component securities of the RAFI Dynamic Multi-Factor U.S. Index. The underlying index is constructed by RAFI Indices, LLC (the index provider) using a rules-based approach to construct factor portfolios within the underlying index. The underlying index consists of factor portfolios, each of which emphasizes one of the following factors: value, low volatility, quality, momentum and size.